How to extract duplicate rows


 
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# 1  
Old 02-26-2011
How to extract duplicate rows

Hi! I have a file as below:
Code:
line1
line2
line2
line3
line3
line3
line4
line4
line4
line4

I would like to extract duplicate lines (not unique, triplicate or quadruplicate lines). Output will be as below:
Code:
line2
line2

I would appreciate if anyone can help. Thanks.

Last edited by radoulov; 02-26-2011 at 08:21 AM.. Reason: Code tags, please!
# 2  
Old 02-26-2011
If your file is sorted then try below.
Code:
awk '{if(a!=$0){if(i==2){print a"\n"a}a=$0;i=0;i++}else{++i;a=$0}}' infile

# 3  
Old 02-26-2011
thanks pravin27,
it works great.
# 4  
Old 02-26-2011
Code:
$ ruby -ne 'BEGIN{h={}};(h[$_] ||= []) << $_;END{h.each{|k,v| puts v.join() if v.size==2}}' file
line2
line2


Last edited by kurumi; 02-26-2011 at 03:05 AM..
# 5  
Old 02-26-2011
Code:
awk '{++a[$0];b[$0]=b[$0]?b[$0]"\n"$0:$0}END{ for (i in a) {if(a[i]==2) print b[i]}}' file

This User Gave Thanks to yinyuemi For This Post:
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